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A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

Defines how often something occurs, such as pulses in a digital signal, or oscillations in a radio wave.
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to ask programming questions regarding reading input from it or blinking the lights, etc.
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A custom structure in C++ (and various other languages) which can contain member data and functions. An instance of a class is called an object.
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Linux is an open source operating system (OS) that is lightweight and runs on many systems. It also runs on the Arduino Yún. There are different "flavors" or "distros" (distributions and changes made …
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Passive electronic component which reduces current flow in a circuit, dissipating power as heat.
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An Atmel 8-bit AVR microcontroller.
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A new paradigm where many, typically microcontroller-driven embedded systems are connected by the Internet, and they are cooperating with eachother to reach common goals, without requiring human-to-hu…
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A semiconductor component used for amplifying or switching electrical signals. Use this tag for discussing transistor circuits.
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Shift registers are used to convert a serial string of bits into parallel data, or vice-versa.
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The WS2812 Integrated Light Source from Adafruit.
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An electro-mechanical device for detecting angular position and/or motion.
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For questions about communication or data transfer between Arduino and Android devices. General Android questions can be asked on Android.SE.
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For question related to environment with networks.
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In-system programming (ISP) refers to the ability of chips to be programmed while installed in the system.
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atmega32u4 is low-power Atmel 8-bit AVR RISC-based microcontroller
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A stepper motor or step motor or stepping motor is a brushless DC electric motor that divides a full rotation into a number of equal steps. The motor's position can then be commanded to move and hold …
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for the Wire library, used for I2C/TWI communication.
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The analogWrite() function is used to generate a PWM (Pulse Width Modulation) output signal on compatible pins.
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Typically refers to a specific type of device which allows raw serial communication with a PC via USB.
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A thin-film transistor (TFT) screen
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sound is a vibration that propagates as a typically audible mechanical wave of pressure and displacement, through a transmission medium such as air or water.
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A variable in C/C++ which stores the type and location of data in memory.
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Interrupt Service Routine. A function which gets called in response to an interrupt signal.
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if your question is related to signal processing techniques (within the Arduino's capability).
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The process of finding and resolving problems ('bugs') in a hardware and/or software system.
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also known as ANSI/TIA/EIA-485, TIA/EIA-485, EIA-485 or RS-485, is a standard defining the electrical characteristics of drivers and receivers for use in balanced digital multipoint systems. The stand…
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A gps library providing: position, date, time, altitude, speed and course
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Musical Instrument Digital Interface.
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A datatype in C/C++ which stores a single-precision floating point number.
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Port-mapping refers to directly accessing the hardware registers (ports), in particular the input/output ports. Use this tag for discussing direct port access.
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Refers to a crystal oscillator.
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MQTT (Message Queuing Telemetry Transport) is a machine-to-machine (M2M)/"Internet of Things" connectivity protocol. The MQTT protocol enables a publish/subscribe messaging model in an extremely light…
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Refers to Mac operating systems.
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A multiplexer lets you select one signal out of a group of (typically) 8 or 16, for both input and output purposes. Use this tag for discussing multiplexer chips.
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